15. A 12-kg crate rests on a horizontal surface and a boy pulls on it with...
A 313-kg crate rests on a surface that is inclined above the horizontal at an angle of 17.0°. A horizontal force (magnitude = 414 N and parallel to the ground, not the incline) is required to start the crate moving down the incline. What is the coefficient of static friction between the crate and the incline?
A woman exerts a horizontal force of 141 N on a crate with a mass of 30.7 kg (a) If the crate doesn't move, what's the magnitude of the static friction force (in N)? (b) What is the minimum possible value of the coefficient of static friction between the crate and the foor? (ASsume the crate remains stationary.) A block of mass 59.1 kg rests on a slope having an angle of elevation of 20.3. If pushing downhill on the...
4. + -/0.9 points A 29.kg crate rests on a horizontal floor, and a 63-kg person is standing on the crate. (a) Determine the magnitude of the normal force that the floor exerts on the crate. (b) Determine the magnitude of the normal force that the crate exerts on the person. Additional Materials Section 4.9 5. -/0.9 points A 53.0-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.780 and...
1. A person exerts a horizontal force of 125 N on a crate with a mass of 30.0 kg. a. If the crate doesn't move, what's the magnitude of the static friction force? b. What is the minimum possible value of the coefficient of static friction between the crate and the floor? 2. A horse is hamessed to a sled having a mass of 236 kg, including supplies. The horse must exert a force exceeding 1.240 N at an angle...
2. The crate has a mass of 100 kg and rests on the surface for which the coefficient of kinetic friction is 0.25 and the coefficient of static friction is 0.35. If the motor supplies an increasing cable force until the crate moves, and maintains this force magnitude afterwards. Determine (a) the initial acceleration of the crate, (d) the power output developed by the motor when t 2 seconds. The motor has an efficiency of 0.85.
A boy pulls a 25.0-kg box with a 160-N force at 34° above a horizontal surface. If the coefficient of kinetic friction between the box and the horizontal surface is is 0.17 and the box is pulled a distance of 38.0 m, what is the net work done on the box?
A boy pulls a 20.0-kg box with a 160-N force at 39° above a horizontal surface. If the coefficient of kinetic friction between the box and the horizontal surface is 0.18 and the box is pulled a distance of 30.0 m, what is the net work done on the box?
An 85 kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.50. A horizontal force 250 N force is applied to the box. What is the magnitude of the static friction force on the box? A.42N B.250N C.16.5N D.130N E.0.00N
The 50-kg crate shown in Fig. 13-6a rests on a horizontal surface for which the coefficient of kinetic friction is Mik = 0.3. If the crate is subjected to a 400-N towing force as shown, determine the velocity of the crate in 3 s starting from rest. P= 400 N 30° Rolles in Portfolio
A crate of 37.2-kg tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it and observe that the crate just begins to move when your force exceeds 322 N . After that you must reduce your push to 240 N to keep it moving at a steady 29.1 cm/s . A.What is the coefficient of static friction between the crate and the floor? B.What push must you exert to give it an acceleration of 1.11...